scholarly journals Spatial distribution of microplastics in the fluvial sediments of a transboundary river – A case study of the Tisza River in Central Europe

2021 ◽  
Vol 785 ◽  
pp. 147306
Author(s):  
Tímea Kiss ◽  
Szilveszter Fórián ◽  
Gábor Szatmári ◽  
György Sipos
Keyword(s):  
Spatial Distribution ◽  
Central Europe ◽  
Fluvial Sediments ◽  
Transboundary River ◽  
Tisza River

scholarly journals Centurial Changes in the Depth Conditions of a Regulated River: Case Study of the Lower Tisza River, Hungary

2017 ◽  
Vol 10 (1-2) ◽  
pp. 41-51 ◽  
Author(s):  
Gabriel Jonathan Amissah ◽  
Timea Kiss ◽  
Károly Fiala
Keyword(s):  
Central Europe ◽  
Cross Sections ◽  
Morphological Evolution ◽  
Regulated River ◽  
Short Term ◽  
Human Interventions ◽  
The Mean ◽  
Tisza River ◽  
The Cross

Abstract The Tisza River is the largest tributary of the Danube in Central Europe, and has been subjected to various human interventions including cutoffs to increase the slope, construction of levees to restrict the floodplain, and construction of groynes and revetments to stabilize the channel. These interventions have altered the natural morphological evolution of the river. The aim of the study is to assess the impacts of these engineering works, employing hydrological surveys of 36 cross sections (VO) of the Lower Tisza River for the years of 1891, 1931, 1961, 1976 and 1999. The changes in mean depth and thalweg depth were studied in detail comparing three reaches of the studied section. In general, the thalweg incised during the studied period (1891-1931: 3 cm/y; 1931-1961: 1.3 cm/y and 1976-1999: 2.3 cm/y), except from 1961-1976 which was characterized by aggradation (2 cm/y). The mean depth increased, referring to an overall deepening of the river during the whole period (1891-1931: 1.4 cm/y; 1931-1961: 1.2 cm/y; 1961-1976: 0.6 cm/y and 1976-1999: 1.6 cm/y). The thalweg shifted more in the upper reach showing less stabile channel, while the middle and lower reaches had more stable thalweg. Although the cross-sections subjected to various human interventions experienced considerable incision in the short-term, the cross-sections free from direct human impact experienced the largest incision from 1891-1999, especially along the meandering sections.

scholarly journals The Influence of Increased Salvage Felling on Forwarding Distance and the Removal—A Case Study from Croatia

Forests ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 7
Author(s):  
Andreja Đuka ◽  
Zoran Bumber ◽  
Tomislav Poršinsky ◽  
Ivica Papa ◽  
Tibor Pentek
Keyword(s):  
Spatial Distribution ◽  
Management Plan ◽  
Management Unit ◽  
Negative Effects ◽  
Forest Operations ◽  
Spatial Reference ◽  
Infrastructure Network ◽  
Gis Environment ◽  
Research Period

During the seven-year research period, the average annual removal was by 3274 m3 higher than the average annual removal prescribed by the existing management plan (MP). The main reason lies in the high amount of salvage felling volume at 55,238 m3 (38.3%) in both the main and the intermediate felling due to oak dieback. The analysis of forest accessibility took into account the spatial distribution of cutblocks (with ongoing felling operations) and the volume of felled timber for two proposed factors: (1) the position of the cutblock and (2) the position of the removal. Cutblock position factor took into account the spatial position of the felling areas/sites, while removal position factor besides the spatial reference took into account the amount of felled timber (i.e., volume) both concerning forest infrastructure network and forest operations. The analysed relative forest openness by using geo-processing workflows in GIS environment showed four types of opening areas in the studied management unit (MU): single-opened, multiple-opened, unopened and opened areas outside of the management unit. Negative effects of the piece-volume law and low harvesting densities on forest operations are highlighted in this research due to high amount of salvage felling particularly in the intermediate felling by replacing timber volume that should have come from thinnings.

Spatial distribution and geochemistry of heavy metals in soils: A case study from the NE area of Vaslui county, Romania

2017 ◽  
Vol 176 ◽  
pp. 20-32 ◽  
Author(s):  
Traian Ungureanu ◽  
Gabriel Ovidiu Iancu ◽  
Mitică Pintilei ◽  
Marian Marius Chicoș
Keyword(s):  
Heavy Metals ◽  
Spatial Distribution ◽  
Heavy Metals In Soils
Sign in / Sign up

Export Citation Format

Share Document